MQ303A  has very good sensitivity and fast response to alcohol, suitable for portable alcohol detector.

For gas : Alcohol ( ethanol )

Detection range : 20 to 1000ppm

Characteristics of gas : 125ppm alcohol

Sensitivity : R in air / Rin typical gas 3

Sensing Resistance : 4 to 400K in air atmosphere

Response time : 10s (70% Response)

Recovery time : 30s (70% Response)

Heating resistor : 4.5 0.5

Heating current : 130mA

Heating voltage : 0.9V 0.1V

Heating power : 130mW